Muscles of Mastication

Question 1

Temporalis origin

Answer 1

Temporal fossa and deep surface of temporal fascia

Question 2

Temporalis insertion

Answer 2

Coronoid process and anterior border of ramus

Question 3

Temporalis action

Answer 3

Anterior fibres elevate mandible
Posterior fibres retruded mandible

Question 4

Masseter origin

Answer 4

Temporal process of zygomatic bone (superficial head)
Zygomatic arch (superficial and deep heads)

Question 5

Masseter insertion

Answer 5

Angle of mandible and ramus

Question 6

Masseter action

Answer 6

Elevates and protrudes mandible

Question 7

Medial pterygoid origin

Answer 7

Maxillary tuberosity and medial surface of lateral pterygoid plate

Question 8

Medial pterygoid insertion

Answer 8

Medial surface of angle of mandible

Question 9

Medial pterygoid action

Answer 9

Elevates and protrudes mandible
Function in chewing - moves mandible to opposite side

Question 10

Lateral pterygoid origin

Answer 10

Greater wing of sphenoid bone and lateral surface of lateral pterygoid plate

Question 11

Lateral pterygoid insertion

Answer 11

Neck of mandible and capsule/intracapsular disc

Question 12

Lateral pterygoid action

Answer 12

Depresses and protrudes mandible
Lateral movements